Sunan an-Nasa'i 2354
سنن النسائي#2354Sahihأَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ سَعْدِ بْنِ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا عَمِّي، قَالَ حَدَّثَنَا أَبِي، عَنِ ابْنِ إِسْحَاقَ، قَالَ حَدَّثَنِي مُحَمَّدُ بْنُ إِبْرَاهِيمَ، عَنْ أَبِي سَلَمَةَ، عَنْ عَائِشَةَ، قَالَتْ لَمْ يَكُنْ رَسُولُ اللَّهِ صلى الله عليه وسلم لِشَهْرٍ أَكْثَرَ صِيَامًا مِنْهُ لِشَعْبَانَ كَانَ يَصُومُهُ أَوْ عَامَّتَهُ .
It was narrated that 'Aishah said:"The Messenger of Allah did not fast any month more than Shaban; he used to fast (all of) it, or most of it
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 22:265